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Darwin Correspondence Project

To J. S. Burdon Sanderson   1 October [1873]1

Down, | Beckenham, Kent.

Oct 1.

My dear Dr. Sanderson.

I hear from Frank that Drosera has been behaving perversely.2 I write a line, as it may possibly have a bearing on this perversity, viz that the motor influence is sent from the excited glands more quickly & completely in a longitudinal than in a transverse direction in the lamina of the leaf.3


Yours very sincerely | Ch Darwin


The year is established by the relationship between this letter and the letter to J. S. Burdon Sanderson, 9 September [1873].
For CD’s experiments on the transmission of the motor impulse in the tentacles of Drosera, see Insectivorous plants, pp. 236–54.


Insectivorous plants. By Charles Darwin. London: John Murray. 1875.


Hears from Frank [Darwin] that Drosera behaves perversely. Suggests that motor influence may move longitudinally away from the excited glands.

Please cite as

Darwin Correspondence Project, “Letter no. 9081,” accessed on 4 August 2021,

Also published in The Correspondence of Charles Darwin, vol. 21